> I'm more curious how/why the author ended up with a $500 gift card. That's a large amount, and the author never shares how this was obtained, which seems like a key missing detail. Did the author buy the gift card for himself (why?) or did someone give him a very large gift (why not mention that?)

The author mentions a big store (names it similar to Walmart for US based readers).

I would assume this was an accepted form of "return a product without a receipt" or "we want to accept your complain about this product we sold going crazy 1 day after it's warranty but we cannot give you cash back" etc